Automatically download and update your translations fetching them from localize.drupal.org or any other Localization server.
Normally drupal.org inserts version information when a project is packaged. Git repositories do not contain this information. Git Deploy hooks into the Drupal update system and attempts to provide the version of modules and themes checked out of git.
spent some time today trying to figure out how to create a CCK field as part of an hook_update_N function. Unlike previous versions of CCK, in 6 it's very easy to manipulate the fields from code.
A lot of this hassle can be reduced by installing drupal from cvs rather than installing one of the releases, and by keeping your installation under version control